Which groups of organisms are the most successful air breathing land invertebrates?
a. Frogs
b. Snails
c. Lobsters
d. Spiders
e. Birds
d
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Which of the following best describes cyanobacteria?
A. They all can use H2S as a source of electrons for photosynthesis. B. Their photosynthetic pigments are carried in chlorosomes. C. They carry out anoxygenic photosynthesis. D. They carry out oxygenic photosynthesis.
An enzyme substrate complex is represented by
a. C. b. D. c. E. d. D and E. e. None of these.
Choose the true statements about the evolution of larval dispersal in marine snails.
A. Cladistics shows that there are more instances of the transition from dispersing to non-dispersing larvae than the reverse. B. Loss of structures in the transition from dispersing to non-dispersing may inhibit evolutionary reversal. C. Possession of dispersing larvae is the ancestral state in snails. D. The evolution of non-dispersing snails is likely to hinder speciation. E. Clades of non-dispersing snails are less species rich than those of dispersing snails.
In the synthesis of amino acids, the addition of the amino nitrogen usually occurs ________ the synthesis of the carbon skeletons.
A. after B. during C. before